create and add data in array in javascript code example

Example 1: javascript append to array

var colors=["red","white"];
colors.push("blue");//append 'blue' to colors

Example 2: how to add a new item in an array in javascript

let array = ["Chicago", "Los Angeles", "Calgary", "Seattle", ]
  // print the array 
console.log(array)
  //Adding a new item in an array without touching the actual array     
array.push('New Item') < variable_name > .push( < What you want to add > )
  //How many items does the array have?
console.log("This array has", array.length, "things in it")